of those four listed, I'd think AB is the only one who'd suffer if it's above 90F. The Australians seem impervious to the heat!
Yeah living in the heat continually will do that for you. I'm not certain they've all experienced the wilting humidity the Chattanooga can dole out on bad days. As it stands, the average weather for that date is reasonably mild. It's the potential weather that's so variable in Chattanooga unlike Kona which is very predictable temperature and humidity wise but not so much for winds. The record temperature in Chat for September 9th is 102*F versus 95*F for Kona any day of the year.
Genetics load the gun, lifestyle pulls the trigger.